Thinking Effort and Context Size buttons aren't working as expected

- Copilot Chat Extension Version:
- VS Code Version:
- OS Version:

- Feature (e.g. agent/edit/ask mode): Configuring Thinking Effort and Context Size in the Models menu (ctrl+alt+.)
- Selected model (e.g. GPT 4.1, Claude 3.7 Sonnet): N/A
- Logs: Not sure which logs you want. Happy to post them with some guidance on where to find them.

Steps to Reproduce:

1. Click the Models icon or use the keyboard shortcut (default ctrl+alt+.) while you have the cursor in the chat box.
2. Mouse over and hover over a model with a configurable Thinking Effort and Context Size (e.g. Claude Sonnet 5)

3. Try to click either the `Thinking Effort` or `Context Size` buttons - the model menu will just close and no options or UI displays to actually configure either of these.
I just updated VSCode versions and this behavior started. I forget which version I was on before, but it didn't have this issue.